Corrugated bar.



A. L. JOHNSON.

CORRUGATED I APPLXOA'HOI nun r: 1m.

Patent Jan 2 a Inn- 1.

A. L. JOHNSON. CORRUGATED DAB. APPLIOA'HOI nun run. 10, um.

Patented Jan. 24. 1911.

3 lIllTl-IIIIT 9.

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UNITED s'ma rz s PATENT OFFXCEL ALIIRT L. JOHNSON, OF ST. LOUIS, MISSOURI, ABBIGNOR, BY DIRECT AND HEBNH;

AIIIONMENTS. TO CORRUGATED BAR COIPANY, 01 17..

PORATION OF MISSOURI.

LOUIS, MIflBOUP-I. A COR- GORRUGATED RAE.

- Specification of Lcttcra Patent.

Patented Jan. 24, 1931..

To all whom it may concern:

Be it known that. I, Amaa'r L. JoimsoN, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Corrugated Bars, of which the following is a s x'citication.

My invention relates to-eorrugatcd bars and especially to corrugated bars for metal concrete construction and has for its principal objects to provide a bar having spaced transverse projections on its faces arranged in rows longitudinally of the bar, the rows being arranged in complementary sets and the relation of the rows ofciu-h set to each olherheingtixml; to utilize thcprojcetious to contribute to the tensile strength of the bar; to provide a corrugated bar having longitudinal rows of irojections and spaces arranged in sets, tlic projections and spaces being so proportioned that at any cross-scetion of the bar the area of one or more projections will compensate for the reduction Ill area by the spaces; to provide a corrugated bar of such construction that any transverse section will pass through at least as many projections as spaces between projections; to provide a corrugated bar of such coast ruction that any transverse section will assthrough projections upon at least one ialt' ol' the incl; of the bar; and to 'attain other objects hereinafter more fully appearing.

My invention consists in a corrugated bar having longitudinal rows of alternate transverse projections and spaces, a plurality of which rows bear a tixed relation to-ono another.

in the accompanying drawings forming a pan. of H is s wcineation and wherein like symbols refer to like parts wherever they occur, Fi ure 1 is a perspective view of my improve: bar; Fig. .3 is a section on the line 2- ".2 of Fig. 1; Fig. 3 is a side view of the hm rest ing on edge; Fig. 4 is a section on the line 4"; of Fig. 8; Fig. 5 is a development of the bar; Fig. 6 is a development of the bar in the form in which it is'preferrcd to make it: Fig. 7 is u. cross-section of a circular'bar embodying my invention: Fig! 8 is a section on the line 8-4! of Fig. 7: Fig. 9 is a view of one face of a modifiedform'of Fig. 10 ia a cross section ofa bar of triangu ar cross section having faces conforming to the modification shown in Ifig 9: Fig. 11 is a perspective view of a circular liar embodying my invention: Fig. 12 is a side view of the round her shown in Fi 11: l ig. 13 is a side view of the IOllllt bar turned a z uartcr turn with respect to the position o the bar in Fig. 12' and Fig. 1c is a cross section of an elliptical bar embodying my invention, the arrangement. being similar to the round bar.

in metal concrete construction it is desiralile to use corrugated bars for many reasons. The hitherto known forms of such bars have projections that are narrow in comparison with the spaces between them. Consequently, tiers are transverse sections which do not p .51 through a single proje tion. in such a bar the projections do not contribute to the tensile strength, for a bar is only as strong as its weakest section. The bar is necessarily heavy for the minimum section must contain enou h metal to give the required strength, an to this in ttdtlttl the weight of the projections for example, seu Patent No. 033,285, tuned to me So itembcr 19, 1809.

n my improved bar the projections are similar to hose in the bars shown in my prior patent but are 50 arranged and propertlOlttt as to contribute to the tensile strength. This is accomplished by arranging the projections and spaces so that any transverse section will pass through atleast as many projectionsas spaces. In a bar oi? given strength it. is necesaa for a section t rough two projections an two spaces to have only the area of the minimum aection of the old form of bar. Thus the bar will he of substantially the weight of a plain bar havin a section equal to the minimum section 0 the old form of bar. An amount of metal an! to the weight of the projections on the bld form of bar is therefore saved.

The bar is preferably quadrangular in cram-section each of the facca havin nata rojections 1 and apaoea 2. T e'pro- 'ections rcferahly have flat faces 8 and veled e gee 4.

The bars arepreferabl rolled by-rollera having angular roovee, t no upper roll forming two faces 0 the ear and the lower roll forming the other two i'aoes. The relative Y poaition of the projectiona and apacea on one of the two faces made by the name roll with respect to the p'ro'ectiona and apaoea the other face is fixe But on account .0

alterthe project ions.

l. eveled-edges of the projections are in line with each other; and the faces of the projections equal in width the spaces between 'l'herefore considering a. triangular section formed by a plane in the line of contact of the rolls as indicated by und the relation of the rows made h same. roll is tixed.

coupes A bar oi circular cross-section is illus' trated in l 'ig's. ti and ti. 'Ehis bar dili'ers from the qnadran'ular bar just described only in having cy indrical faces instead of llat, faces. In practice such a bar is rolled in rollersv having semi-circular grooves. Thus one pair ot' rows of alternate projections and spaces may be madeby each roll Obviously. more t tan a pair of runs ttl ltl'tljtd'llttllrl and spaceseould te imprcssed by the s tall roll aml the metal htltllalllllllll'tl that. at. any section the area of one or more projections should be at least spaces.

the dotted line in Fig. 4, all transverse sections are equal. This is true. of hot-h the triangular sections making the complete bar: Hence, the cross-section of the bar is eouslant however much the two triangular sections may be relatively displaced with respect to each other on account of the relative movementaif the rolls mentioned above. This may he clearly seen by an inspection of Fig. l: which is a development oft to her, or a view of the bar such as wouldbe had it it were opened out so that its {our faces were in the same plane. it shows all four faces, the pair of faces made b one roll being dis ilaced with respect to t to pair of faces mat a by the other roll, approximately half the width of the space in this ligure. The diagonally opposite corners of the bar formed at the meeing point of the twoirolls are slightly truncated. The spaces terminate in' a wall substantial! parallel with decline of contact of the re is and substantiall perpendicular to the truncated corner.

Th s preferred form of bar is illustrated by W 6 whichis a development thereof.

It di ere from the bar just described only in the relative location of the beveled edges of the projections upon the two faces made by the same roll. The pairs of beveled edges upon these faces, instead of being in line with each other, are displaced by an amount substantially equal to their width so that each is opposite the body of the projection upon the adjacent face. .This form. is substantially of constant. cross-section and is a more practicable form to roll. lf rolls were designed to roll the form of exactly constant cross-section they would soon wear so as to produce substantially this preferred form. The preferred form has also the advantage of increased strength in the lin of angular fracture across the din minds of the spaces between projections. A racture can-.

not extend from a space on one face to a ace on an adjacent face without. passing t rough a portion of at least one pro ection. This incremed'strcngth is secured with an increase in weight that is practically negliibe.

as great. as the reduction in the area due to bar having any number (iffaces may he emploved.

modi'lied form of face applicable to a I bar havin; any number of faces is shown in Fig. l). The face is provided with two rows of alternate projeclionsl and spaces 2. The projections of one row are staggered Willi respect to the projections of the' other row in the same manner that the projections of the. rows upon dilierent faces are arranged in the forms described above. A section of a triangular bar of substantially constant cross-section embodying this modification is illustrated in Fig. ll).

In Fig. tithe concrete 5, in which the corrugated bars are embedded in use is shown. The concrete has been omitted from the Hillel figures as its presenee'would serve to obscure the features of the bar.

Obviously, in device is capable of considerable mmlitieation within the am of my invention and therefore 1 do not wish to be limited to the specific construction shown aml described. For instance the bar may he elliptical in cross-section, the circular bar illustrated in Figs. 7'and 8 being simply a particular case. of the elliptical bar.

What I claim as my invention and desire to secure by Letters Patent is:

1. A corrugated bar having a plurrlity of faces and spaced transverse projections on.

each face, said lprojections being arranged m rows longitut inallyof the bar, the rows of projections arranged in pairs, each pen having the projections in one row l ranged with respect to the projections in the other row that the sectional area of the bar at any point is suhstantiall equal to the sectional area at any other point.

" A corrugated bar having a plurality n-la of faces and spaced transverse projections on each face. said infectious-being arranged in rows longitudinal y of thebar nnd the projections of eaclrrow being separated by spaces, the rows of projections bein arranged in pairs. of each pair of whic the pro ections of one row are in line with the spaces of the other row, and each projection being least as wide as the space in alinezneet therewith.

the

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3. vurrngatml ltltl' ha ring a plurality of turns amt altt-ruuto trauswrm' projoot ions and spat-w. upon rat-h fat-o arrangrtt in longitutlinat rows. tluprujM-tions of oat-h ron' hr- 6 ing in ltltt' with tlnspurns, t't's|u't'ti\t-ly, of our of tho lltlittt'tltt rows, antltho lllttjt't'tinllt-l tiring so ltl'tllttll'tlllltl'lt \vith walla-rt to tho qua-twin alim-nu-nt tlu-rrwith that anytranswmst't'tiult 7 through tlulaw will pass 10 through at toast as many projm-tiuus as spat-as.

'l. A rorrugatt-tl liar having a plurality .-ot' pair of lat-mullet tt'unsvt'lsn projt-otiouu on tttt'll t'arr st-paratml hy allttt't'fi, thr proluring in lino with tho 5 tart-s IIpon tln: othrr fat-u of tilt saltupail til fart-s.

5, rorrugatmt har having a plurality of fut-rs, amt tll-ttl'tttltt' tranm rrmprojt' tious mat a uu-tm arrungml in roux-1 on ttltt fauna, a plum it) of .fi'llltl rows luniuga tixmt rotation in our anotla-l', lltu projt'rtiomtulnl spawns of said rows lu-iug ataggt'rrtt with roeuwt-t toouo aaotlu-r. nntt oat-h projvt'tion hriup at trust an as wiih' as lllt' spawn in ltltllt'ltl 'ttltlua't'with.

rorrugatt-it har having a plurality of pairs of laws amt attornatu pro't-vtious utul an-w upon rarh taro, tho u'op-t-tiotni upon uln' l'at-tof ra -h pair of t art-s tiring Maggi-rial with rt-qm-t to tho. projm-tions upon the othrr fare of Haiti pair of tacos, \rhrrrhy any ll'tlltfiVt'l'St! N't'tllilt will pas through at loud. as many projm-tious as H'ltll'l'fi- T. vorrugatmt tau tuning: a plurality of pairs of farm unit trauswrm projt-otiona nu oat-h fart- M'llitl'tttt'tt hy SINIHN, the pro- "rt-lionon vac-h lat-o of l'lltlt pair of laws wing in Mun aith tho luau-vs. r n m'tiri-ty.

40 upon lltt'ttlitl'l' t'm-t ot' saitl mirot' aura tllttl t'llt'll projm-tiou living at. t-u.-t as withan tlupanin alitu-nu-nt ttu-rrwith.

H, t-orrugutt-tt lmr having a ilarulity of pairs of fu -vs amt ln'yol-utgnal projmsthan; upon rat-h t'aw st'lmlttlt'tl lay spacoa, tho lav-m ol' -aiit 'Dltljt't'lltIlI-i living at. least. :u ltlt' as tho. \Itilt't'i, amt tho projnctions upon oua'l'tu-o of each pair of fact-s bring in lino wit-h tluspaces upon thuotlu-r fat-a of said pair of faces.

9. A corrugated bar of quadrangular rm:- 801' ion having alternate pmjmtious amt spurns on all its faces, the projw-tioas on t'ttt'lt t'nw hoiutg Maggi-ml with twpvat to tho projoot'iolm on one of tho tuljaeont faces amt saitt spam-s bring of substantially uniform th-pth from projection to pro'eotion.

amt spam-a ou atl its ftlltt'tt, tho prop'rtioln on t'ttt'll taro living in lino with tho spaces, l'rs u-t-tivt-ly, on one of the attjaront, tact-s am living so prtumrtiont-tl with respect. to the spam-s iu alinameat thaw-with that any through at. toast. two projmstiona.

t7I|HSN't'!iUII havingalternate projortions amt spat-m on all its farm. the projections on t'tt 'll taro bring in lino with tho spams, t"?-pm'ti\'t-ly, on ouo 0- tho attjart-nt fares amt t'tlt'it projwtion hoing at. lt'tlat as 'itit'. as tho spam in aliut-uu-nt tharewith.

t2. torrugatetl bar of quath-"wgular rro.-.+st-rtiou having hevt'l-t-ilgrtl projt-t-tiomt on all itstacra separated by bptttft'fi, thu faces of Sttltt project-ions being at. least. as with! as the spaces, and the projections upon each tat-o wing in line VII"! the s amt-s, respontiwly, on one of the mljarrnt act's.

lit. A mrrugatml ll!!! of quadrangular mam-oration lowing alturnatttraum'om' projt-utioua and sputum, tho pmjectionu on ouo fntro twin ct'ntralty nllllttl with the apnoea, lt'hlttt'tlvt y, on one of the adjacent fact's, ttm projm-ttoan lupin slightly wider than the tiptltft'fl in central 1 intanant therewith.

In testimony whereof I have signed my uauw to this upmilhsatiou in tho pvt-"mm of two mtlm-rihiu witamua.

A llt't'ilt'l I. JOHNSON. In tho prosruco 0t Fina F. Baum an, R. Lmcom Mum-am 

